Enter the following codes at the Password screen under Options. To activate, go to the Bonus screen:
| BUTTERFLY | All Missions |
| GOBY | Infinite Ammo |
| MANDARIN |
Achilles Head mode |
| PUFFER | Always Sniper mode |
| TANG | Bullet Shield mode |
| TILEFISH | Silver Bullet mode |
| DAMSEL | Rubber Grenades mode |
| HOGFISH | Perfectionist mode |
| TRIGGER | Invisible Soldiers mode |
| SEAHORSE | Men with hats |
| SPINEFOOT | Huge arms |
| GARIBALDI | All replay items |